Published Online: November 21, 2013. doi:10.1001/jamaophthalmol.2013.5698.
Study concept and design: Singh, Covert, Henry, Bhatia, Han.
Acquisition of data: Covert, Henry, Bhatia, Croskrey, Sanchez, Han.
Analysis and interpretation of data: Singh, Henry, Bhatia, Han.
Drafting of the manuscript: Singh, Han.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Singh, Covert, Henry, Bhatia, Croskrey.
Study supervision: Han.
Conflict of Interest Disclosures: None reported.
Funding/Support: This work was supported in part by an unrestricted grant from Research to Prevent Blindness, Inc (Medical College of Wisconsin), by the Thomas M. Aaberg Sr Retina Research Fund, and by the Jack A. and Elaine D. Klieger Professorship in Ophthalmology (Dr Han).
Role of the Sponsor: The funding organizations had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.